Based on a cable-stayed bridge with a main span of 808 m and double-level decks for highway and railway， the vortex-induced vibration （VIV） performance of the double-level decks of truss girder section under different wind attack angles and the vibration suppression effects of five aerodynamic control measures were studied by the section model wind tunnel tests. Combined with the static flow simulation via computational fluid dynamics （CFD）， the VIV mechanism and control method of the double-level deck truss girder section were compared and analyzed， respectively. The research results show significant vertical and torsional VIV of the original main deck at +3° and 0° wind attack angles， and the amplitudes exceed the allowable values of the code. The torsional vortex vibration of the main girder can be effectively suppressed by enclosing the upper deck railings at intervals or adding flaps. However， the amplitude of the vertical VIV of the main girder exceeds the allowable values of the code. Furthermore， adding wind fairing at the outside of the upper chord can effectively suppress the vertical and torsional vortex vibration of the main girder. However， the main girder vortex vibration cannot be effectively suppressed by adding the wind fairing at the outside of the lower chord. Moreover， after the air flow is separated from the upper deck of the original design section of the main girder， periodic large-scale vortex shedding on its upper and lower surfaces is formed， and then attached to the rear of the upper deck， which is the main cause of the vertical VIV of the main girder. The wind fairing located at the outside of the upper chord can guide the airflow smoothly through the upper deck， eliminating periodic vortex shedding. Additionally， an along and narrow reattachment zone is formed on its upper surface. As a result， this effectively suppresses the VIV of the main deck.